/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshDecompositionFunctions.h
CopyMeshSelectionToMesh should be used instead of this function
static [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * GetSubMeshFromMesh ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * StoreToSubmesh, [FGeometryScriptIndexList](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptIndexList) TriangleList, [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) *& StoreToSubmeshOut, [UGeometryScriptDebug](API\Plugins\GeometryScriptingCore\GeometryScript\UGeometryScriptDebug) * Debug )